Comparison of soil reflectance spectra and calibration models obtained using multiple spectrometers

a Biological and Agricultural Engineering Department, MS 2117, Texas A&M University, College Station, TX 77843-2117, USA b Soil and Crop Sciences Department, Texas A&M University, 370 Olsen Boulevard, College Station, TX 77843-2474, USA c Soil and Water Science Department, University of Florida Gainesville, 2169 McCarty Hall, Gainesville, FL 32611-0290, USA d Department of Crop and Soil Sciences, Washington State University, 249 Johnson Hall, Pullman, WA 99164-6420, USA e School of Natural Sciences, University of California, Merced, P.O. Box 2039, Merced, CA 95344, USA